A motorcycle travelling at 120 kilometers per hour on the highway passes a car travelling at 90 kilometers per hour. What is the motorcycle's speed as seen from the perspective of a car passenger?
Let us denote the motorcycle's velocity as VA and the car's velocity as VB.
VAB = VA – VB
We get VAB = 120 km/h – 90 km/h = 30 km/h by substituting the variables in the above equation.
As a result, the motorcycle's relative velocity to the car's passenger is 30 km/h.